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Linux/drivers/usb/host/ehci-w90x900.c

  1 /*
  2  * linux/driver/usb/host/ehci-w90x900.c
  3  *
  4  * Copyright (c) 2008 Nuvoton technology corporation.
  5  *
  6  * Wan ZongShun <mcuos.com@gmail.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation;version 2 of the License.
 11  *
 12  */
 13 
 14 #include <linux/dma-mapping.h>
 15 #include <linux/io.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/of.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/usb.h>
 21 #include <linux/usb/hcd.h>
 22 
 23 #include "ehci.h"
 24 
 25 /* enable phy0 and phy1 for w90p910 */
 26 #define ENPHY           (0x01<<8)
 27 #define PHY0_CTR        (0xA4)
 28 #define PHY1_CTR        (0xA8)
 29 
 30 #define DRIVER_DESC "EHCI w90x900 driver"
 31 
 32 static const char hcd_name[] = "ehci-w90x900 ";
 33 
 34 static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
 35 
 36 static int ehci_w90x900_probe(struct platform_device *pdev)
 37 {
 38         struct usb_hcd *hcd;
 39         struct ehci_hcd *ehci;
 40         struct resource *res;
 41         int retval = 0, irq;
 42         unsigned long val;
 43 
 44         hcd = usb_create_hcd(&ehci_w90x900_hc_driver,
 45                         &pdev->dev, "w90x900 EHCI");
 46         if (!hcd) {
 47                 retval = -ENOMEM;
 48                 goto err1;
 49         }
 50 
 51         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 52         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 53         if (IS_ERR(hcd->regs)) {
 54                 retval = PTR_ERR(hcd->regs);
 55                 goto err2;
 56         }
 57         hcd->rsrc_start = res->start;
 58         hcd->rsrc_len = resource_size(res);
 59 
 60         ehci = hcd_to_ehci(hcd);
 61         ehci->caps = hcd->regs;
 62         ehci->regs = hcd->regs +
 63                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 64 
 65         /* enable PHY 0,1,the regs only apply to w90p910
 66          *  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
 67          *  w90p910 IC relative to ehci->regs.
 68          */
 69         val = __raw_readl(ehci->regs+PHY0_CTR);
 70         val |= ENPHY;
 71         __raw_writel(val, ehci->regs+PHY0_CTR);
 72 
 73         val = __raw_readl(ehci->regs+PHY1_CTR);
 74         val |= ENPHY;
 75         __raw_writel(val, ehci->regs+PHY1_CTR);
 76 
 77         irq = platform_get_irq(pdev, 0);
 78         if (irq < 0) {
 79                 retval = irq;
 80                 goto err2;
 81         }
 82 
 83         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 84         if (retval != 0)
 85                 goto err2;
 86 
 87         device_wakeup_enable(hcd->self.controller);
 88         return retval;
 89 err2:
 90         usb_put_hcd(hcd);
 91 err1:
 92         return retval;
 93 }
 94 
 95 static int ehci_w90x900_remove(struct platform_device *pdev)
 96 {
 97         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 98 
 99         usb_remove_hcd(hcd);
100         usb_put_hcd(hcd);
101 
102         return 0;
103 }
104 
105 static struct platform_driver ehci_hcd_w90x900_driver = {
106         .probe  = ehci_w90x900_probe,
107         .remove = ehci_w90x900_remove,
108         .driver = {
109                 .name = "w90x900-ehci",
110         },
111 };
112 
113 static int __init ehci_w90X900_init(void)
114 {
115         if (usb_disabled())
116                 return -ENODEV;
117 
118         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
119 
120         ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
121         return platform_driver_register(&ehci_hcd_w90x900_driver);
122 }
123 module_init(ehci_w90X900_init);
124 
125 static void __exit ehci_w90X900_cleanup(void)
126 {
127         platform_driver_unregister(&ehci_hcd_w90x900_driver);
128 }
129 module_exit(ehci_w90X900_cleanup);
130 
131 MODULE_DESCRIPTION(DRIVER_DESC);
132 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
133 MODULE_ALIAS("platform:w90p910-ehci");
134 MODULE_LICENSE("GPL v2");
135 

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